Bicycle-brake.



No. 670,473. vPatented Mar. 26,1901.v L.P N. DYHRBERG. BICYCLE BRAKE.

(Appliczion med sepa. 9, 1697.)

(N n M ode Il) .UHF WIS PENRS w., PHOTQUTHC" WASHINGTON, B4 C UNriEo STATES PATENT @Erica LAVERUX NELSON DYHRBERG, OF ASHBURTON, NEW ZEALAND.

BICYCLE-BRAKE.

SPEGIFCATEON forming part of Letters Patent N o. 670,473, dated March 26, 1901. Application filed September 9, 1897. Serial No. 651,083. (No model.)

T @ZZ whom it may concern:

Beit known that LLAvnRUx NELSON DYHR- BERG, a subject of the Queen of Great Britain and Ireland,and a resident of Ash burtonanterbury, in the Colony of New Zealand, have invented certain new and useful improved Brake-Gearing for Cycles, (for which I have made application for patent in New Zealand, No. 9,301, dated February 24, 1897,) of which io the following is a specification.

This invention relates to improved brakegearing for cycles, the object being to apply an effective brake-power by means of friction clutch-gearing operated by the feet.

In my invention a friction-clutch is tted in a clutch-box on the driving chain-wheel, to the face of which clutch the brake is counected by means of a suitable rod. The rear chain Wheel forms another clutch -box in zo which a similar clutch is fitted, (to work in an opposite direction to that 0n the drivingwheel,) so that when the cranks are turned ina forward direction the driving chain-wheel, with its clutch-box, rotates free of the clutch, while the clutch-box on rear chain-wheel by the action of the chain engages the clutchl within it and propels the machine; but when a backward pressure is exerted upon the cranks by the feet the clutch-box on driving 3o chain-wheel engages the clutch within it, thus stopping the motion of the chain and both chain-wheels and at the same time actuating the brake, while the rear wheel of machine is free to rotate until stopped by the brake.

5 When the brake is not required to be used,

the clutch on rear wheel may be locked by means of a suitable device, hereinafter described. If desired, instead of a clutch being fitted within the driving` chain-wheel for 4o operating the brake a clutch-box may be of the clutch-box and clutch on rear wheel, the face-plate being removed. Fig. 3 is an enlarged sectional view of the clutch-box and clutch in driving chain-wheel, the face-plate also being removed. Fig. 4 is an enlarged longitudinal section through the crank-hanger and driving chain-wheel, showing the clutchbox and clutch and hanging cran k to which the brake-connecting rod is attached. Fig. 5 is an enlarged longitudinal section through the cran k-hanger and driving chain-wheel, showing another mode of attaching the chainwheel and clutch. Fig. 6 is a side elevation of saine, showing brake-connecting rod. Fig. Tis a plan showing the inode of connecting brake to the rear forks of machine and also the means of attaching brake to connectingrod.

The same letters of reference denote like parts where they occur in the several figures.

Referring to Figs. l, 2, 3, and 4, A is the clutch-box, formed on or attached to the driving chain-wheel B, in which clutch-box the clutch-block C and rollers a are fitted, the face-plate b, which is fixed to said block, fitting against the end of the crank-hanger cand having a hanging crank d, to which the brake D is connected by means of the rod e, the arms f of the said brake being pivotally connected to the rear forks E of the machine, as hereinafter described. The brake D is provided with pads of suitable material, which when the power is exerted clip the inner side of the rim of the rear Wheel of the machine.

By making the recess in the hub of the wheel cup-shaped-that is,extending from the center toward the periphery-a very strong and cheaply-constructed clutch mechanism is secured, as the block c can be made annular or in the form of a perforated disk which fits within the recess without any additional support than the balls in the recesses in its periphery which bear against the inner wall ofthe recess in the hub of the wheel. The block is of such a thickness that its outer face is just flush with the side of Athe hub: of the Wheel, so that when the plate b is in position its edge will extend beyond the periphery of the block and rest against the side of the hub, thereby closing the recess to prevent` the entrance of dust or the escape of the balls. The hub of the wheel is located at such a dis- IOO tance from the end of the crank-hanger that the crank d, which is in the form of a perforated plate, will just iit between the hanger and the plate h, and thus hold the block c and plate Z9 in position.

The rear chain-wheel F is constructed to form another clutch-box in which the clutchblock G and rollers g are fitted, the said chainwheel being tted loosely on the hub h, but` the clutch-block is screwed thereon.

It will be readily seen that when the machine is driven forward the driving chainwheel B will rotate free of the clutch-block C and rollers ct, while the rear chain-Wheel F, clutch-block G, and rollersg therein rotate with the wheel of the machine; but when a backward pressure is imparted to the cranks the clutch-block C causes the rollers a to eugage the clutch-boX A, and simultaneously by means of the chain the rollers g are caused to disengage from the clntchbox of the rear chain-wheel F, thereby stopping the motion of both chain-wheels and chain, and at the same time drawing the brake D against the rim of the rear wheel, which is enabled to rotate free of the chain-wheel F and clutch until stopped by the brake.

Referring to Figs. 5 and 6, which illustrate; another mode of attaching the driving chainl Wheel B with clutch-box A and clutch-block C with rollers therein it will be seen that the crank-hanger c is lengthened and provided with a flange z', forming the face-plate of the clutclrblock C', this flange being provided with an arc-shaped slotj, through which a pin k, secured into the clutch-block G, passes, and to which pin the brake-connecting rod e' is secured, another iiange t" being secured to the end of the crank-hanger to retain said clutch-block in position. In this arrangement, when the backward pressure is im` parted to the cranks, the clutch-block C is caused to turn back when the pin 7e moves in the slot j and draws up the brake upon the rim of the rear wheel of the machine.

Referring to Fig. 7, which more fully illustrates the brake D and mode of connecting it to rod e and also to the rear forks E, it will be seen that the brake is formed of two parts and that the armsfare pivotally connected to the lugs f', formed on said rear forks, by means of screws f2, which are passed loosely through said lugs and screwed into the arms f, a shoulder being formed on each screw so as to be iiush'with the inside of the lug to prevent jamming. The two parts of the brake are brought together outside the wheel and secured by a bolt and nut Z, with a thickness piece or washer m between the said two parts, the end of rod e being placed between the said parts and pivotally connected by means of the bolt and nut n.

Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

In a brake for bicycles, the combination with the pedal-shaft, of a clutch thereon operative only on back-pedaling, a clutch on the rear Wheel inoperative on back-pedaling, a lug on each side of the rear fork, a brake member provided With an arm pivotally secured to each lug, the rear end of the member being provided with a pad to engage with the rim of the rear wheel, and the front ends of the two members being curved toward each other and rigidly secured together, and a brake-rod pivotally securedbetweenthe perforated portions of the arms at one end and connected with the clutch on the crank-shaft at the other.

In witn ess whereof I have hereunto set my hand in presence of two witnesses.

Witnesses:

A. l-I. HART, GEORGE HART. 

